When Venus passes directly between earth and the sun, we see the distant planet as a small dot gliding slowly across the face of the sun. Historically, this rare alignment is how we measured the size of our solar system. The view is like a front row seat to the transit method, by which we now find planets around distant stars.
Source: transitofvenus.org
The 2012 transit of Venus, when the planet Venus appeared as a small, dark disk moving across the face of the Sun, began at 22:09 UTC on 5 June 2012, and finished at 04:49 UTC on 6 June. [1]
Depending on the position of the observer, the exact times varied by up to ±7 minutes. Transits of Venus are among the rarest of predictable celestial
phenomena and occur in pairs eight years apart: [2]
the previous transit was in June 2004, and the next pair of transits will not occur until December2117 and December 2125.
Source: wikipedia.org
This image is taking from slooh.com to view transit of venus live online on Broome, Australia.
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